Computer running Windows 7 is very slow [Anwsered]

Computer running Windows 7 is very slow

I have been trying for the last several days to fix one of my computers that is running very slow.
 
There are 3 ajor problems I have observed:
 
1.  The system will not allow Windows to up date.
 
2.  When I press Cntrl + Alt + Del, and select Task Manager, I get a window that just shows the processes that are running.  There are no other tabs that I can select to end any processes.
 
3.  I can use the resource monitor and observe what is happening.  This shows major disk and network activity, with no programs running.
 
I have run scans with Total Defense anti-virus, found problems and corrected them.  Also run scans with Malwarebytes Antimalware and Geek Tech Tool Box,found problems and corrected them.  None of these actions have changed anything.
 
I also tried Windows Defender Offline, I could not get it to work.
 
Does anyone know what might be happening here?

Solutions to the Problem Computer running Windows 7 is very slow

Download SmartPCFixer to Fix It (Free)

Open Action Center by clicking the Start button Picture of the Start button, clicking Control Panel, and then, under System and Security, clicking Review your computer's status.

Update and run your antivirus software. Windows doesn't come with antivirus software, but Action Center can often monitor the antivirus software that you or your computer manufacturer have installed.

Another Safe way to Repair the Problem: Computer running Windows 7 is very slow:

How to Fix Computer running Windows 7 is very slow with SmartPCFixer?

1. Click the button to download SmartPCFixer . Install it on your computer.  Open it, and it will scan your computer. The junk files will be shown in the list.

2. After the scan is done, you can see the errors and problems which need to be fixed.

3. When the Fixing part is done, your computer has been speeded up and the errors have been removed

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